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Manganese dioxide asymmetric supercapacitor and preparation method thereof

A supercapacitor and manganese dioxide technology, applied in capacitors, electrolytic capacitors, circuits, etc., can solve the problems of high price and unsuitability for large-scale production, and achieve the effects of low cost, increased energy density, and large potential window

Active Publication Date: 2016-06-01
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ruthenium oxide is the most typical representative. It is reported in the literature that the pseudocapacitive specific capacitance produced by amorphous ruthenium hydrate is as high as 720F / g. However, due to the high price of ruthenium, it is not suitable for large-scale production.

Method used

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  • Manganese dioxide asymmetric supercapacitor and preparation method thereof
  • Manganese dioxide asymmetric supercapacitor and preparation method thereof
  • Manganese dioxide asymmetric supercapacitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 1.0g of potassium permanganate and 0.5g of hydrated manganese sulfate, and then dissolve them in deionized water to obtain 15ml and 5ml of solutions; under strong stirring, add the manganese sulfate solution to the potassium permanganate solution drop by drop for 10 minutes. The addition is completed; transfer the mixed solution to a hydrothermal reaction kettle until the filling rate is 90%, hydrothermally react at 100°C for 3 hours to obtain a brown-black precipitate; wash with deionized water and dry at 80°C for 24 hours to obtain flower-shaped manganese dioxide .

[0026] Using absolute ethanol as a dispersant, mix the prepared flower-shaped manganese dioxide with the conductive agent VGCF and the binder polytetrafluoroethylene in a mass ratio of 80:15:5, and evenly coat the foamed nickel, 80 °C drying to obtain a positive electrode.

[0027] Using absolute ethanol as a dispersant, mix activated carbon, conductive agent VGCF, and binder polytetrafluoroethylen...

Embodiment 2

[0030] Weigh 0.5g of activated carbon in 15ml of deionized water and sonicate for 1h, add 1.0g of potassium permanganate, and sonicate for 2h; dissolve 0.5g of manganese sulfate hydrate in 5ml of deionized water, and sonicate for 2h; The solution was added dropwise to the potassium permanganate / activated carbon solution, and the dropwise addition was completed in 10 minutes; the mixed solution was transferred to a hydrothermal reaction kettle until the filling rate was 90%, and after a hydrothermal reaction at 100°C for 3 hours, it was washed with deionized water and kept at 80°C Drying at low temperature for 24h, the nano-manganese dioxide / activated carbon composite material was obtained.

[0031]Using absolute ethanol as a dispersant, the prepared nano-manganese dioxide and activated carbon composite flower-shaped manganese dioxide were mixed with the conductive agent VGCF and the binder polytetrafluoroethylene in a mass ratio of 85:10:5. Evenly coated on foamed nickel, drie...

Embodiment 3

[0035] Weigh 1.0g of potassium permanganate and 0.5g of hydrated manganese sulfate, and then dissolve them in deionized water to obtain 15ml and 5ml of solutions; under strong stirring, add the manganese sulfate solution to the potassium permanganate solution drop by drop for 10 minutes. The addition is completed; transfer the mixed solution to a hydrothermal reaction kettle until the filling rate is 90%, hydrothermally react at 100°C for 3 hours to obtain a brown-black precipitate; wash with deionized water and dry at 80°C for 24 hours to obtain flower-shaped manganese dioxide .

[0036] Using absolute ethanol as a dispersant, mix the prepared flower-shaped manganese dioxide with the conductive agent VGCF and the binder polytetrafluoroethylene in a mass ratio of 90:5:5, and evenly coat the foamed nickel, 80 °C drying to obtain a positive electrode.

[0037] Using absolute ethanol as a dispersant, mix activated carbon, conductive agent VGCF, and binder polytetrafluoroethylene...

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Abstract

The invention relates to a manganese dioxide asymmetric super capacitor and a manufacturing method of the super capacitor; the manganese dioxide asymmetric super capacitor is characterized in that a positive pole of the super capacitor is made of flower-like manganese dioxide or nano manganese dioxide / active carbon composite material with higher pseudocapacitance, and a negative pole of the super capacitor is made of porous carbon with large specific surface area; a water solution system containing univalent or divalent cation is adopted as electrolyte of the super capacitor; and the asymmetric super capacitor formed by encapsulation has the characteristics of being higher in energy density, low in cost, safe and free from pollution.

Description

technical field [0001] The invention relates to a manganese dioxide asymmetric supercapacitor and a preparation method thereof, belonging to the technical field of batteries and supercapacitors. Background technique [0002] Supercapacitor is a new type of energy storage device with high specific power density, long cycle life, and high charge-discharge rate. It has broad application prospects in electric vehicles, aerospace defense, electronic communications and other fields. A supercapacitor is mainly composed of a positive electrode, a diaphragm, a negative electrode, an electrolyte, and an encapsulation case, in which the electrode active material directly affects the performance of the supercapacitor. [0003] According to the energy storage mechanism of supercapacitors, the materials can be divided into two categories: one is the electric double layer materials that use the electric double layer mechanism to store energy, such as activated carbon, activated carbon fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/042H01G9/035
CPCY02E60/13
Inventor 韩金磊荣常如张克金曹婷婷魏传盟
Owner CHINA FIRST AUTOMOBILE
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